package com.cse333.jester;

import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class LibraryActivity extends FragmentActivity implements ActionBar.TabListener {

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
     * will keep every loaded fragment in memory. If this becomes too memory
     * intensive, it may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_library);

	// Set up the action bar.
	final ActionBar actionBar = getActionBar();
	actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
	// Show the Up button in the action bar.
	actionBar.setDisplayHomeAsUpEnabled(true);

	// Create the adapter that will return a fragment for each of the three
	// primary sections of the app.
	mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

	// Set up the ViewPager with the sections adapter.
	mViewPager = (ViewPager) findViewById(R.id.pager);
	mViewPager.setAdapter(mSectionsPagerAdapter);

	// When swiping between different sections, select the corresponding
	// tab. We can also use ActionBar.Tab#select() to do this if we have
	// a reference to the Tab.
	mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
	    @Override
	    public void onPageSelected(int position) {
		actionBar.setSelectedNavigationItem(position);
	    }
	});

	// For each of the sections in the app, add a tab to the action bar.
	for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
	    // Create a tab with text corresponding to the page title defined by
	    // the adapter. Also specify this Activity object, which implements
	    // the TabListener interface, as the callback (listener) for when
	    // this tab is selected.
	    actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i))
		    .setTabListener(this));
	}
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
	// Inflate the menu; this adds items to the action bar if it is present.
	getMenuInflater().inflate(R.menu.activity_library, menu);
	return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
	switch (item.getItemId()) {
	case android.R.id.home:
	    // This ID represents the Home or Up button. In the case of this
	    // activity, the Up button is shown. Use NavUtils to allow users
	    // to navigate up one level in the application structure. For
	    // more details, see the Navigation pattern on Android Design:
	    //
	    // http://developer.android.com/design/patterns/navigation.html#up-vs-back
	    //
	    NavUtils.navigateUpFromSameTask(this);
	    return true;
	}
	return super.onOptionsItemSelected(item);
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
	// When the given tab is selected, switch to the corresponding page in
	// the ViewPager.
	mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

	public SectionsPagerAdapter(FragmentManager fm) {
	    super(fm);
	}

	@Override
	public Fragment getItem(int position) {
	    // getItem is called to instantiate the fragment for the given page.
	    // Return a DummySectionFragment (defined as a static inner class
	    // below) with the page number as its lone argument.
	    Fragment fragment = new DummySectionFragment();
	    Bundle args = new Bundle();
	    args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
	    fragment.setArguments(args);
	    return fragment;
	}

	@Override
	public int getCount() {
	    // Show 3 total pages.
	    return 3;
	}

	@Override
	public CharSequence getPageTitle(int position) {
	    switch (position) {
	    case 0:
		return getString(R.string.title_section1).toUpperCase();
	    case 1:
		return getString(R.string.title_section2).toUpperCase();
	    case 2:
		return getString(R.string.title_section3).toUpperCase();
	    }
	    return null;
	}
    }

    /**
     * A dummy fragment representing a section of the app, but that simply
     * displays dummy text.
     */
    public static class DummySectionFragment extends Fragment {
	/**
	 * The fragment argument representing the section number for this
	 * fragment.
	 */
	public static final String ARG_SECTION_NUMBER = "section_number";

	public DummySectionFragment() {
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
		Bundle savedInstanceState) {
	    // Create a new TextView and set its text to the fragment's section
	    // number argument value.
	    TextView textView = new TextView(getActivity());
	    textView.setGravity(Gravity.CENTER);
	    textView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
	    return textView;
	}
    }

}
